How severe is CVE-2021-39321?

CVE-2021-39321 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39321 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39321?

CVE-2021-39321 affects Heateor Sassy Social Share. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39321?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39321 published?

CVE-2021-39321 was published on 2021-10-21 and last updated on 2026-06-17.

CVE-2021-39321

CVE-2021-39321 is a high-severity vulnerability in Heateor Sassy Social Share with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Heateor Sassy Social Share
Published: 2021-10-21
Last modified: 2026-06-17

Description

Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJAX action due to deserialization of unvalidated user supplied inputs via the import_config function found in the ~/admin/class-sassy-social-share-admin.php file. This can be exploited by underprivileged authenticated users due to a missing capability check on the import_config function.

Frequently asked questions

What is CVE-2021-39321?: Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJAX action due to deserialization of unvalidated user supplied inputs via the import_config function found in the ~/admin/class-sassy-social-share-admin.php file. This can be exploited by underprivileged authenticated users due to a missing capability check on the import_config function.
How severe is CVE-2021-39321?: CVE-2021-39321 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39321 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39321?: CVE-2021-39321 affects Heateor Sassy Social Share. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39321?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39321 published?: CVE-2021-39321 was published on 2021-10-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:heateor:sassy_social_share:3.3.23:*:*:*:*:wordpress:*:*

More vulnerabilities in Heateor Sassy Social Share

CVE-2024-1989 — Medium (CVSS 6.4): The Social Sharing Plugin – Sassy Social Share plugin for WordPress is vulnerable to Stored Cross-Site Scripting via…
CVE-2024-1448 — Medium (CVSS 6.4): The Social Sharing Plugin – Sassy Social Share plugin for WordPress is vulnerable to Stored Cross-Site Scripting via…
CVE-2025-5528 — Medium (CVSS 6.1): The Social Sharing Plugin – Sassy Social Share plugin for WordPress is vulnerable to Reflected Cross-Site Scripting…
CVE-2024-11252 — Medium (CVSS 6.1): The Social Sharing Plugin – Sassy Social Share plugin for WordPress is vulnerable to Reflected Cross-Site Scripting…
CVE-2022-4971 — Medium (CVSS 6.1): The Sassy Social Share plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'urls' parameter…
CVE-2024-4924 — Medium (CVSS 6.1): The Social Sharing Plugin WordPress plugin before 3.3.63 does not sanitise and escape some of its settings, which…

All CVEs affecting Heateor Sassy Social Share →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →